Abstract
We report magnetotransport measurements performed in magnetic fields of up to 33 T and at low temperatures (0.45 K<T<4.2 K) on two iso-structural superconducting charge-transfer salts, β-(BEDT-TTF) 4 [(H 3 O)M(C 2 O 4 ) 3 ]. C 6 H 5 NO 2 , where the 3d metal ion M is either non-magnetic Ga 3+ or magnetic Cr 3+ . Quantum oscillations suggest that the salt with M = Ga has two two-dimensional Fermi surface pockets (45 T and 230 T) whereas when M = Cr only one pocket (230 T) is observed. Replacing Ga with Cr has the effect of enhancing the effective mass of of the 230 T pocket from 1.2 ± 0.2 m e to 2.2 ± 0.3 m e and reducing the superconducting critical temperature from T c 8 K to T c 5 K.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
